Damper regulator



Nov. 26, 1935.

W. D. LEWIS DAMPER REGULATOR Filed April 5, 1935 INVENTOR A9. M

ATTORNEYS.

Patented Nov. 26, 1935 UNITED STATES PATENT QFEEQE 17 Claims.

This invention relates to damper regulators and more especially to an adjusting attachment for regulating the damper in a forced draft duct of a boiler furnace. It is customary to control such a damper with a conventional damper regulator having a definite length stroke through which it operates to move the damper from full closed to full open position. However, a minimum amount of air is required to maintain combustion and oftentimes full opening of the damper results in excessive air supply.

An object of this invention is a simple and inexpensive attachment by which the damper can be adjusted for any desired minimum open or maximum closed position and for maximum open position resulting from operation of the damper regulator with the movement of the damper between minimum and maximum open positions being proportional to the movement of the the damper regulator.

Other objects, novel features and advantages of this invention will become apparent from the following specification and accompanying drawing, wherein:

Fig. 1 is a diagrammatic illustration of a damper-control mechanism equipped with an adjuster embodying the invention;

Fig. 2 is a side elevation with the damper being in minimum open position;

Fig. 3 is a view similar to Fig. 2 with a damper in maximum open position;

Fig. 4 is a section on the line Z-4 of Fig. 2, and

Fig. 5 is a section on the line 55 of Fig. 2.

In Fig. 1, l indicates the feed pipe of a forced draft duct for a boiler furnace and l l indicates a regulator having a reciprocating member of definite length stroke, such device being well-known in the art and, therefore, not being described in detail herein. A transmission system composed of rods [2, l3 and it and bell-crank levers l and It extends from the regulator it to the pipe It for connection to the damper later to be described.

The damper shaft ii is journalled in the pipe l0 and the damper i8 is fixed thereto. Stops E9 in the pipe are engageable by the damper 18 to limit clockwise rotation thereof. One end of the shaft I! projects beyond the pipe It and has an arm 26 pinned thereto. A member 2! is rotatably mounted on the shaft it between the pipe it and the arm 29, the shaft extending through the member at a point intermediate the ends of the member 2|.

A screw-threaded sleeve 22 is supported at one end of the member 2! by a pivot pin 23 about the axis of which the sleeve 22 is rotatable. A head 24 is pivoted tothe end of the arm 25] and in the head 24 is journalled one end of a rod 25, the other end of which is screw-threaded and passes through the sleeve 22, a head 26 and a collar 21 being provided to limit axial movement of the rod 25 relative to the sleeve 22. By rotation of the rod 25 by means of the handle 28, the angular relation between the arm 2d and member 23 and correspondingly the angular relation between the member 23 and the damper it may be adjusted.

A bar 29 is integral with or fixed to the remain ing end of the member 2i and extends at right angles thereto. A threaded sleeve 36 is slidably mounted on the bar 29 and is connected to the end of the link it. A rod 3i has one end journalled in a head as formed at the lower end of the member 25 and is provided with a handle 33. This rod extends parallel to the bar 29 and passes through the sleeve to, the rod being screwthreaded for engagement therewith. Rotation of the rod 3! moves the sleeve fit into different positions of adjustment with respect to the bottom end of the member 2i.

Referring now more especially to Figs. 2 and 3, the full line positions of the various elements indicate their position when the damper is set for full closure and full opening upon operation of the reciprocating member in the regulator i i. In Fig. 2 the damper i8 is in contact with the stops it and the collar 2? is in engagement with -the sleeve 22 and the damper is in alinement with the member 2! which is in vertical position. Operation of the regulator ll causes the rod it to rise through a predetermined distance bringing the member 2! into oblique position and with it the damper it, as shown in full lines in Fig. 3. When it is desired to set the damper for a certain minimum opening, the rod is rotated to bring the arm 28 into the dot-dash position, shown in Fig. 2 with the damper assuming the dot-dash position also shown in this figure and now, with the member ii in vertical position, the damper has a certain minimum opening and cannot be closed beyond such position.

The position assumed by the damper 58 at the conclusion of an operating stroke of the regulator may be determined by adjustment of the sleeve Ell on the bar 29. Outward movement of the sleeve on the bar decreases the are through which the sleeve is moved by a full upward stroke of the rod I l, thus regulating the angular movement of the damper. Thus, the maximum open position of the damper may be adjusted without in any way affecting the minimum open position of the damper. In general, the opening of the damper is greater the nearer the sleeve 38 is brought to the member 2 I.

The minimum open position of the damper is controlled by the angular relation between the damper and the member 25 while the maximum open position is controlled by the extent of angular movement of the member it, the extent of its movement being regulated by the position of with outward movement of the sleeve 30 on the rod 29 with a consequent reduction in the extent of angular movement of the member 2|.

It is of course understood that various modifications may be made in the device above described, without in any way departing from the spirit of the invention as defined in the appended claims.

I claim:

1. The combination with a rotatable shaft, of a member rotatably mounted thereon, a second member rigidly mounted thereon, means to vary the angular relation of said members, an arm extending from one of said members at an angle thereto, a slide mounted on said arm, and means to adjust the position of said slide on said arm.

2. The combination according to claim 1 in which said shaft is journalled in a pipe with one end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

3. The combination with a rotatable shaft, of a member rotatably mounted thereon, a second member rigidly mounted thereon, means to vary the angular relation of said members, an arm extending from said first member at an angle thereto, a slide mounted on said arm, and means to adjust the position of said slide on said arm..

4. The combination according to claim 3 in which said shaft is journalled in a pipe with one end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe. I

5. The combination with a rotatable shaft, of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on one of said members, a threaded rod journalled on the other of said members and passing through said sleeve, an arm extending from one of said members at an angle thereto, a slide mounted on said arm, and means to adadjust the position of said slide on said arm.

6. The combination according to claim 5 in which said shaft is journalled in a pipe with one end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

7. The combination with a rotatable shaft of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on said first member, a threaded rod journalled on said second member and passing through said sleeve, an arm extending from said second member at an angle thereto, a slide mounted on said arm, and means to adjust the position of said slide on said arm.

8. The combination according to claim 7 in which said shaft is journalled in a pipe with one end projectng on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

9. The combination with a rotatable shaft, of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on said first member, a threaded rod journalled on said second member and passing through said sleeve, an arm extending from one of said members at an angle thereto, a slide mounted on said arm, and means to adjust the position of said slide on said arm.

10. The combination according to claim 9 in which said shaft is journalled in a pipe with one 5 end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

11. The combination with .a rotatable shaft, of a member rotatably mounted thereon, a second 10 member rigidly mounted thereon, means to vary the angular relation of said members, an arm extending from one of said members at .an angle thereto, a slide mounted on said arm, a threaded sleeve carried by said slide and a threaded rod journalled in said member, said rod passing through said sleeve, and constituting means for adjusting the position of said slide on said arm.

12. The combination according to claim 11 in which said shaft is journalled in a pipe with one end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

13. The combination with a rotatable shaft, of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on one of said members, a threaded rod journalled on the other of said members and passing through said sleeve, an arm extending from one of said members at an angle thereto, a slide mounted on said arm, a threaded sleeve carried by said slide, and a threaded rod rotatably supported by said second member, said rod passing through said sleeve and constituting means for adjusting the position of said slide and 5 said arm.

14. The combination according to claim 13 in which said shaft is journalled in a pipe with one end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

15. The combination with a shaft of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on said second member, a threaded rod journalled on said first member and passing through said sleeve, an arm extending from one of said members at an angle thereto, a slide mounted on said arm, a threaded sleeve carried by said slide, and a threaded rod rotatably supported by said sec- 0nd member, said rod passing through said sleeve, and constituting means for adjusting the position of said slide and said arm.

16. The combination according to claim 15 in which said shaft is journalled in a pipe with one 5 end projecting on which are mounted said first and second members, and a damper is fixed to said shaft within said pipe.

1'7. The combination with a rotatable shaft of a member rotatably mounted thereon, a second member rigidly mounted thereon, a threaded sleeve mounted on said first member, a threaded rod journalled on said second member and passing through said sleeve, an arm extending from said first member at an angle thereto, a slide mounted on said arm, a threaded sleeve carried by said slide, and a threaded rod journalled on said member, said rod passing through said sleeve and constituting means for adjusting the position of said slide on said arm.

WARREN D. LEWIS. 

